The numbers 2^n with 1's and 2's swapped, then sorted.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =26a(5) =31a(6) =64a(7) =156a(8) =218a(9) =521a(10) =1048a(11) =2014a(12) =4096a(13) =8291a(14) =26384a(15) =31768a(16) =65536a(17) =161244a(18) =232071a(19) =514188a(20) =1097251a(21) =2048576a(22) =4294304a(23) =8388608a(24) =26777126a(25) =33554431a(26) =67208864a(27) =168435456a(28) =234127718a(29) =536870921